Method for preparing multiple products including hemicellulose, carboxylated cellulose nanocrystals, fibrils and citrate from fibers by using citric acid

A technology of carboxylated cellulose and hemicellulose, which is applied in the field of natural polymer green preparation technology, to achieve high yield, reduce the introduction of toxic substances, and reduce the effect of preparation

Active Publication Date: 2020-05-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] So far, there is no report on the "one-step integrated" preparation of hemicellulose, carboxylated cellulose nanocrystals (CNC) and cellulose nanofibrils (CNF) and citrate multi-component products from fiber materials by citric acid hydrolysis.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The method for preparing hemicellulose, carboxylated cellulose nanocrystals, fibrils and sodium citrate multi-component products from fibers with citric acid comprises the steps:

[0050] (1) The bagasse material is ground into powder, sieved, the sieve size is 40 mesh, then soaked in ethanol solution for pretreatment, the pretreatment time is 0.5 hour, after removing ethanol, the bagasse after ethanol pretreatment is obtained and pulverized particles;

[0051] (2) At a temperature of 100° C., add 5 g of absolutely dry bagasse pulverized particles pretreated with ethanol to 80% citric acid aqueous solution (80 g of citric acid, 20 ml of deionized water) and react for 2 hours to obtain a hydrolyzed suspension;

[0052] (3) The hydrolyzed suspension is vacuum filtered through a G4 sand core funnel to obtain solid fibers and filtrate; the solid fibers are repeatedly added to deionized water and centrifugally washed at 4000r / min until neutral; the filtrate is neutralized by...

Embodiment 2

[0056] The method for preparing hemicellulose, carboxylated cellulose nano crystals, fibrils and potassium citrate multi-component products from fibers with citric acid comprises the steps:

[0057] (1) Grinding the bagasse material into powder, sieving, the sieve hole size is 40 mesh, then soaking in ethanol solution for pretreatment, the pretreatment time is 1 hour, after removing ethanol, the bagasse after ethanol pretreatment is obtained and pulverized particles;

[0058] (2) At a temperature of 100° C., add 5 g of absolutely dry bagasse pulverized particles pretreated with ethanol to 80% citric acid aqueous solution (80 g of citric acid, 20 ml of deionized water) and react for 2 hours to obtain a hydrolyzed suspension;

[0059] (3) The hydrolyzed suspension is vacuum filtered through a G4 sand core funnel to obtain solid fibers and filtrate; the solid fibers are repeatedly added to deionized water and centrifugally washed at 4000r / min until neutral; the filtrate is neutra...

Embodiment 3

[0063] The method for preparing hemicellulose, carboxylated cellulose nanocrystals, fibrils and sodium citrate multi-component products from fibers with citric acid comprises the steps:

[0064] (1) The bagasse material is ground into powder, sieved, the sieve hole size is 40 mesh, then soaked in ethanol solution for pretreatment, the pretreatment time is 1.5 hours, after removing ethanol, the bagasse after ethanol pretreatment is obtained and pulverized particles;

[0065] (2) At a temperature of 60° C., add 5 g of absolutely dry bagasse pulverized particles pretreated with ethanol into 50% citric acid aqueous solution (50 g of citric acid, 50 ml of deionized water) and react for 2 hours to obtain a hydrolyzed suspension;

[0066] (3) The hydrolyzed suspension is vacuum filtered through a G4 sand core funnel to obtain solid fibers and filtrate; the solid fibers are repeatedly added to deionized water and centrifugally washed at 4000r / min until neutral; the filtrate is neutral...

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Abstract

The invention discloses a method for preparing multiple products including hemicellulose, carboxylated cellulose nanocrystals, fibrils and citrate multicomponent products from fibers by using citric acid. The method comprises the following steps: with fibers as a base material, preparing hemicellulose through citric acid hydrolysis and alcohol precipitation, preparing citrate through crystallization, preparing cellulose nanocrystals through ultrasonic treatment and centrifugation, and preparing cellulose nanofibrils from solid fibers through homogenization. The method is friendly to environment, free of toxicity, low in risk, high in fiber component utilization rate, diversified in high-value products and high in yield. The prepared cellulose nanocrystals and cellulose nanofibrils have dispersion stability, excellent specific surface area and high carboxyl content, and lay a foundation for nanocellulose modification. Finally, prepared nanocellulose has no residual toxic and harmful substances, and has wide application prospects in the aspect of functional materials taking cellulose as a substrate, especially in the aspects related to health, such as biomedical materials, food, health care products, skin care cosmetics and the like.

Description

technical field [0001] The invention belongs to the field of natural polymer green preparation technology, and in particular relates to a method for preparing hemicellulose, carboxylated cellulose nanocrystals, fibrils and citrate multi-component products from fibers with citric acid. Background technique [0002] Cellulose and hemicellulose are natural polysaccharide compounds with a high molecular structure and are the main components of plant cell walls. Cellulose and hemicellulose are the most abundant renewable resources on the earth, and they are also the most abundant natural polymer compounds in nature. They are widely found in the cell walls of various plants, algae, and fungi. They are non-polluting, degradable, With the advantages of non-toxicity, renewable, low cost and easy modification, it is expected to replace petroleum as the main raw material of energy and chemical industry in the future. [0003] Nanocellulose, the smallest structural unit of cellulose, r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/14C08B15/04C07C51/41C07C59/265B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C07C51/41C08B15/04C08B37/0003C08B37/006C07C59/265
Inventor 宋涛祁海松廖思煌杨喆岑钰熊海平罗元超陈功
Owner SOUTH CHINA UNIV OF TECH
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